單項(xiàng)選擇題

二尖瓣M型超聲心動(dòng)圖，圖中尖頭所示兩點(diǎn)稱為 ( )

A．E點(diǎn)和A點(diǎn)
B．D點(diǎn)和C點(diǎn)
C．F點(diǎn)和G點(diǎn)
D．高點(diǎn)和底點(diǎn)
E．前點(diǎn)和后點(diǎn)

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